Electrospun Nb-doped CeO2 nanofibers for humidity independent acetone sensing

Zhang, Wenjian; Wang, Xukun; Wu, Junnian; Wang, Xinge; Lv, Xueliang; Li, Bingsheng; Zhou, Jinyuan; Xie, Erqing; Zhang, Zhenxing

doi:10.1016/j.apsusc.2022.154303

Cited by 33 publications

(17 citation statements)

References 51 publications

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“…34-0394), respectively, are observed . Furthermore, the absence of a distinct Nb 2 O 5 peak in the XRD patterns indicates the successful formation of the Nb–Ce–O solid solution upon Nb addition, as supported by the results of EDX mapping. ,, Notably, no significant NiO peak is observed in the XRD patterns due to the low Ni loading and the uniform dispersion of NiO particles. , …”

Section: Resultsmentioning

confidence: 71%

“…21 The energy-dispersive X-ray spectroscopy (EDX) element mapping in Figure 1e reveals the distribution of Ce and Nb, indicating the successful doping of Nb into the CeO 2 lattice, resulting in a solid solution with a uniform distribution of elements. 40 Moreover, the nanosized NiO is uniformly distributed on NbCe without any aggregation, confirming the presence of abundant contact surfaces and robust interactions between NiO and the NbCe support. 41 On the other hand, the HRTEM image of Ni/Ce in Figure 1d indicates that the CeO 2 support results in the formation of large particles with an irregular distribution, and NiO aggregates heavily on the surface of the CeO 2 carrier.…”

Section: Resultsmentioning

confidence: 73%

“…The abundant contact interface between Ni and the NbCe support further promotes the hydrogenation reaction . The energy-dispersive X-ray spectroscopy (EDX) element mapping in Figure e reveals the distribution of Ce and Nb, indicating the successful doping of Nb into the CeO 2 lattice, resulting in a solid solution with a uniform distribution of elements . Moreover, the nanosized NiO is uniformly distributed on NbCe without any aggregation, confirming the presence of abundant contact surfaces and robust interactions between NiO and the NbCe support .…”

Section: Resultsmentioning

confidence: 93%

“…Notably, the oxygen vacancy ratio of Ni/10NbCe (38.5%) is lower than that of Ni/Ce (47.1%). This discovery implies that the doping of Nb 5+ hinders the formation of oxygen vacancies due to the substitution of Ce 4+ with an additional electron which satisfies the covalent bond coordination. ,,, The Raman spectra were further provided to verify the oxygen vacancy concentrations for different catalysts (Figure S3). The obtained spectra exhibited two distinct peaks at 460 and 590 cm –1 , corresponding to the F 2g octahedrally symmetrical vibration modes and the D stretching vibration resulting from the presence of oxygen vacancies, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…11 Furthermore, the absence of a distinct Nb 2 O 5 peak in the XRD patterns indicates the successful formation of the Nb−Ce−O solid solution upon Nb addition, as supported by the results of EDX mapping. 40,42,43 Notably, no significant NiO peak is observed in the XRD patterns due to the low Ni loading and the uniform dispersion of NiO particles. 16,39 To gain insights into the reduction process of Ni species in the Ni/NbCe catalyst, hydrogen-programmed temperature reduction experiments (H 2 -TPR) were conducted on catalysts with different Nb doping levels, as shown in Figure 2b.…”

Section: Resultsmentioning

confidence: 99%

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Niobium Modification of CeO₂ Tuning Electron Density of Nickel–Ceria Interfacial Sites for Enhanced CO₂ Methanation

Zou,

Meng,

Liu

et al. 2023

Inorg. Chem.

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CO 2 methanation has attracted considerable attention as a promising strategy for recycling CO 2 and generating valuable methane. This study presents a niobium-doped CeO 2 -supported Ni catalyst (Ni/NbCe), which demonstrates remarkable performance in terms of CO 2 conversion and CH 4 selectivity, even when operating at a low temperature of 250 °C. Structural analysis reveals the incorporation of Nb species into the CeO 2 lattice, resulting in the formation of a Nb−Ce−O solid solution. Compared with the Ni/CeO 2 catalyst, this solid solution demonstrates an improved spatial distribution. To comprehend the impact of the Nb−Ce−O solid solution on refining the electronic properties of the Ni−Ce interfacial sites, facilitating H 2 activation, and accelerating the hydrogenation of CO 2 * into HCOO*, in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) analysis and density functional theory (DFT) calculations were conducted. These investigations shed light on the mechanism through which the activity of CO 2 methanation is enhanced, which differs from the commonly observed CO* pathway triggered by oxygen vacancies (O V ). Consequently, this study provides a comprehensive understanding of the intricate interplay between the electronic properties of the catalyst's active sites and the reaction pathway in CO 2 methanation over Ni-based catalysts.

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Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Niobium Modification of CeO₂ Tuning Electron Density of Nickel–Ceria Interfacial Sites for Enhanced CO₂ Methanation

Zou,

Meng,

Liu

et al. 2023

Inorg. Chem.

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Room Temperature Wearable Gas Sensors for Fabrication and Applications

Xiao

Wang

et al. 2023

Advanced Sensor Research

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The recent surge in demand for human–machine interaction (HMI), Internet of Things (IoTs), and artificial intelligence (AI) has created both opportunities and challenges for room‐temperature wearable gas sensors. These sensors serve as a source of perceptual information and can be easily integrated into wearable electronic devices due to their portability and miniaturization. In recent years, various types of wearable room temperature gas sensors have been developed for fields like environmental monitoring, healthcare, smart home, industrial security, food safety monitoring, and public security. These sensors not only adjust to the movements of human effortlessly but also have reduced power consumption. Therefore, room temperature wearable gas sensors hold great promise for the development of integrated intelligent gas sensing system worn on the human body. These sensors can be fabricated using various sensing materials to detect diverse target gases. This review provides a comprehensive summary of the preparation of sensing materials with extraordinary sensing capabilities at room temperature. Additionally, the article includes a brief discussion of the sensing mechanism, employing four models to explain it: oxygen adsorption, direct electron transfer, proton transfer, and ions conduction. Finally, this article discusses the various applications and future perspectives of room‐temperature wearable gas sensors.

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UV Light‐Driven Photocatalytic Performance of CeO₂ and Co Ion‐Doped CeO₂ Nanoparticles: High‐Efficiency Electrochemical and Chromaticity Blue LED Application

Silambarasan,

Perisetti,

Ramesh

et al. 2024

ChemistrySelect

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The study assesses the efficacy of CeO2 nanoparticles synthesised via the hydrothermal method for UV‐induced catalytic activity in decomposing cobalt complexes. Various analyses, including X‐ray diffractometry (XRD), Raman spectroscopy, scanning electron microscopy (SEM), high‐resolution transmission electron microscopy (HR‐TEM), and UV‐Vis spectrophotometry were employed to investigate the impact of cobalt on cerium oxide's morphology, optical, electrochemical, and microstructural characteristics. The XRD analysis revealed a cubic structure in the fluorite‐type pattern, primarily oriented along the (111) direction. Raman spectroscopy supported these findings, identifying an active mode peak at 464 cm−1 and indicating the presence of F2g cubic fluorite. SEM imaging displayed cleavage and uniform, densely packed grains. Elemental analysis confirmed the presence of Ce, O, and Co, corroborated by X‐ray Photoelectron Spectroscopy (XPS) data. Optical measurements indicated a band gap starting at 3.03 eV, which decreased with increasing Co ratio, reaching 2.9 eV at 4 % cobalt incorporation. Furthermore, cyclic voltammetry experiments demonstrated that Co‐doped samples exhibited enhanced ion storage capacity. These comprehensive analyses underscore the potential of Co‐doped CeO2 nanoparticles for UV‐induced catalytic activity, offering valuable insights into their structural and functional properties.

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Electrospun Nb-doped CeO2 nanofibers for humidity independent acetone sensing

Cited by 33 publications

References 51 publications

Niobium Modification of CeO₂ Tuning Electron Density of Nickel–Ceria Interfacial Sites for Enhanced CO₂ Methanation

Niobium Modification of CeO₂ Tuning Electron Density of Nickel–Ceria Interfacial Sites for Enhanced CO₂ Methanation

Room Temperature Wearable Gas Sensors for Fabrication and Applications

UV Light‐Driven Photocatalytic Performance of CeO₂ and Co Ion‐Doped CeO₂ Nanoparticles: High‐Efficiency Electrochemical and Chromaticity Blue LED Application

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Electrospun Nb-doped CeO2 nanofibers for humidity independent acetone sensing

Cited by 33 publications

References 51 publications

Niobium Modification of CeO2 Tuning Electron Density of Nickel–Ceria Interfacial Sites for Enhanced CO2 Methanation

Niobium Modification of CeO2 Tuning Electron Density of Nickel–Ceria Interfacial Sites for Enhanced CO2 Methanation

Room Temperature Wearable Gas Sensors for Fabrication and Applications

UV Light‐Driven Photocatalytic Performance of CeO2 and Co Ion‐Doped CeO2 Nanoparticles: High‐Efficiency Electrochemical and Chromaticity Blue LED Application

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Product

Resources

About

Niobium Modification of CeO₂ Tuning Electron Density of Nickel–Ceria Interfacial Sites for Enhanced CO₂ Methanation

Niobium Modification of CeO₂ Tuning Electron Density of Nickel–Ceria Interfacial Sites for Enhanced CO₂ Methanation

UV Light‐Driven Photocatalytic Performance of CeO₂ and Co Ion‐Doped CeO₂ Nanoparticles: High‐Efficiency Electrochemical and Chromaticity Blue LED Application